Topological and luminescent properties of two coordination polymers constructed from 3-pyridinepropionic acid

Two coordination polymers, [Zn(PPA)2(H2O)2]n (1) and [Cd(PPA)2]n (2) (HPPA = 3-pyridinepropionic acid) have been hydrothermally synthesized. Both of 1 and 2 crystallize in P-1 space group. Zn(II) centers in 1 are extended by PPA ligands to form the 1D chains, which are consolidated by hydrogen bonding to construct a 3D supramolecular network. The structure of 2 represents a rare binodal (3,6)-connected 2D layer with kgd topology. The luminescent properties of 1 and 2 in the solid state are discussed.